本文關(guān)鍵詞： 錨固巖質(zhì)邊坡 錨固參數(shù) 錨桿-砂漿界面 砂漿-巖體界面 界面剪應(yīng)力 永久位移　出處：《煤炭學(xué)報》2017年10期 　論文類型：期刊論文

【摘要】：基于FLAC~(3D)建立錨固巖質(zhì)邊坡數(shù)值分析模型,并用優(yōu)化的cable單元建模分別模擬分析錨桿-砂漿界面上和砂漿-巖體界面上的剪切作用,通過改變?nèi)L黏結(jié)錨桿的錨固參數(shù)(錨固角、錨固段長度、錨桿豎向間距、錨桿直徑、錨孔直徑),對地震作用下錨固巖質(zhì)邊坡錨固界面上的剪應(yīng)力及動力響應(yīng)規(guī)律進行研究。研究發(fā)現(xiàn):在地震作用下,隨著錨固角的增大,錨固界面上的峰值剪應(yīng)力減小,邊坡永久位移增大;當(dāng)錨桿在結(jié)構(gòu)面兩側(cè)的長度相等時錨桿界面的錨固作用最大化;當(dāng)錨桿豎向間距減小,峰值剪應(yīng)力和邊坡永久位移均減小;隨錨桿和錨孔直徑的增大,峰值剪應(yīng)力和邊坡永久位移總體呈減小的趨勢。在考慮安全性、經(jīng)濟性的前提下,建議適當(dāng)減小錨固角和錨桿豎向間距,保持錨桿拉拔段與錨固段長度相等,錨桿和錨孔直徑保持合理的比值。該研究可為相關(guān)理論、試驗研究和錨固邊坡抗震設(shè)計提供參考。
[Abstract]:The numerical analysis model of Anchorage rock slope is established based on FLACX / 3D), and the shear action on the interface between bolt and mortar and on the interface of mortar and rock is simulated and analyzed by the optimized cable element model, respectively. The anchoring parameters (Anchorage angle, length of anchoring section, vertical spacing of anchor rod, diameter of anchor rod, diameter of anchor hole) were changed. The shear stress and dynamic response at the Anchorage interface of Anchorage rock slope under earthquake are studied. It is found that the peak shear stress at the Anchorage interface decreases with the increase of Anchorage angle. The permanent displacement of slope increases; When the length of the bolt on both sides of the structure plane is equal, the Anchorage effect of the bolt interface is maximized. The peak shear stress and the permanent displacement of the slope decrease when the vertical spacing of the bolt decreases. With the increase of the diameter of anchors and anchors, the peak shear stress and the permanent displacement of the slope decrease generally. Considering the safety and economy, it is suggested that the anchoring angle and the vertical spacing of the anchors should be reduced appropriately. The length of the bolt drawing section is equal to that of the anchor section, and the diameter of the anchor rod and the anchor hole keeps a reasonable ratio. This study can be used as a reference for the relevant theory, experimental study and seismic design of the anchoring slope.
【作者單位】： 蘭州大學(xué)土木工程與力學(xué)學(xué)院;河南城建學(xué)院土木與交通工程學(xué)院;
【基金】：國家自然科學(xué)基金面上資助項目(41372307,51478065) 甘肅省建設(shè)科技攻關(guān)資助項目(kjxm2014-42)
【分類號】：TU457;TU476
【正文快照】： 錨固是邊坡治理的常用方法,其結(jié)構(gòu)巧、施工易、造價低、效果好。通過調(diào)研汶川地震邊坡的破壞現(xiàn)象,還發(fā)現(xiàn)錨桿錨固邊坡也具有較好的抗震性能,而目前錨固邊坡動力穩(wěn)定性研究遠(yuǎn)落后于工程實踐,因此急需針對錨桿錨固的核心問題——錨固界面剪切作用進行研究。前人對靜力荷載下的錨

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